Memory Addressing

• Memory reference instructions can address 128 words in current page (page of PC) and 128 words of page zero memory.
• Can use indirect access through memory location to directly address 4k.
• Data Field and Instruction field registers appended to memory address for data and instruction fetch to address 32k words.
• If memory locations 10 through 17 octal of any page are used for indirect addressing they will be incremented before use. Used to improve performance when sequentially accessing memory.
• Core is destructive readout so must be rewritten. Auto increment memory locations and ISZ use the rewrite to do useful work.